document.writeln("<div class=\'layui-col-md2\'>");
document.writeln("      <div class=\'layui-side layui-bg-black\' style=\'margin-top: 59px;\'>");
document.writeln("        <div class=\'layui-side-scroll\'>");
document.writeln("          <ul class=\'layui-nav layui-nav-tree  \' lay-filter=\'test\'>");
document.writeln("            <!-- 侧边导航: <ul class=\'layui-nav layui-nav-tree layui-nav-side\'> -->");
document.writeln("            <li class=\'layui-nav-item \'>");
document.writeln("              <a href=\'javascript:;\'>图书管理</a>");
document.writeln("              <dl class=\'layui-nav-child\'>");
document.writeln("                <dd><a href=\'home.html\'>图书列表</a></dd>");
document.writeln("                <dd><a href=\'book_type.html\'>图书类型</a></dd>");
document.writeln("                <dd><a href=\'supplier.html\'>供应商列表</a></dd>");
document.writeln("              </dl>");
document.writeln("            </li>");
document.writeln("            <li class=\'layui-nav-item\'>");
document.writeln("              <a href=\'javascript:;\'>订单管理</a>");
document.writeln("              <dl class=\'layui-nav-child\'>");
document.writeln("                <dd><a href=\'order_form.html\'>订单列表</a></dd>");
document.writeln("              </dl>");
document.writeln("            </li>");
document.writeln("            <li class=\'layui-nav-item\'>");
document.writeln("              <a href=\'javascript:;\'>用户管理</a>");
document.writeln("              <dl class=\'layui-nav-child\'>");
document.writeln("                <dd><a href=\'user_control.html\'>用户列表</a></dd>");
document.writeln("              </dl>");
document.writeln("            </li>");
document.writeln("          </ul>");
document.writeln("        </div>");
document.writeln("      </div>");
document.writeln("    </div>");